Image forming device and liquid droplet discharging device which apply a voltage prior to printing

Abstract

A liquid droplet discharging device includes a liquid droplet discharging head including a nozzle hole, a pressurized liquid chamber communicating with the nozzle hole, a vibration plate constituting a side of the pressurized liquid chamber, a control device, and a thin film piezoelectric substance to vibrate the vibration plate by a drive voltage to discharge liquid droplets and a voltage application device to apply a voltage waveform having a voltage equal to or greater than the drive voltage between when the main power is activated and when first print starts.

What is claimed is: 
     
       1. An image forming device, comprising:
 a liquid droplet discharging head including a nozzle hole, a pressurized liquid chamber communicating with the nozzle hole, a vibration plate constituting a side of the pressurized liquid chamber, a control device, and a thin film piezoelectric substance configured to vibrate the vibration plate by a drive voltage to discharge liquid droplets; and 
 a voltage application device configured to apply a voltage waveform which is a direct current having a potential which is equal to or greater than a midpoint potential applied when the thin film piezoelectric substance is driven, the voltage waveform which is applied being applied after a main power of the image forming device is supplied to the image forming device and prior to when a first print starts. 
 
     
     
       2. The image forming device according to  claim 1 , wherein:
 the voltage application device applies the voltage waveform while a predetermined signal is sent and received between the control device and a controller connected with the liquid droplet discharging device to control the liquid droplet discharging device. 
 
     
     
       3. The image forming device according to  claim 1 , wherein:
 the voltage application device applies the voltage waveform while a controller of the liquid droplet discharging device is executing a pre-printing setting processing of the liquid droplet discharging device. 
 
     
     
       4. The image forming device according to  claim 1 , wherein the voltage applied by the voltage application device applies a predetermined non-discharging waveform. 
     
     
       5. The image forming device according to  claim 1 , wherein:
 the voltage application device stops applying the voltage waveform in response to receipt of a signal indicating a start of printing is to occur. 
 
     
     
       6. The image forming device according to  claim 1 , wherein:
 the voltage application device stops applying the voltage waveform in response to a predetermined period of time expiring. 
 
     
     
       7. A liquid droplet discharging device, comprising:
 a liquid droplet discharging head including a nozzle hole, a pressurized liquid chamber communicating with the nozzle hole, a vibration plate constituting a side of the pressurized liquid chamber, a control device, and a thin film piezoelectric substance configured to vibrate the vibration plate by a drive voltage to discharge liquid droplets; and 
 a voltage application device configured to apply a voltage waveform having a voltage equal to or greater than the drive voltage between when a main power is activated and when a first print starts, 
 wherein the voltage applied by the voltage application device is a direct current equal to or greater than a midpoint potential applied when the thin film piezoelectric substance is driven.